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《Remote Sensing Technology and Application》 2018-01
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Comparison of Radiometric Quality of GF-1 Satellite Image in Snow-covered Area of Manasi River Basin

Hu Rui;Xiao Pengfeng;Feng Xuezhi;Zhang Xueliang;Jiangsu Provincial Key Laboratory of Geographic Information Science and Tech-nology,Key Laboratory for Satellite Mapping Technology and Applications of State Administration of Surveying,Mapping and Geoinformation of China,Department of Geographic Information Science,School of Geographic and Oceanographic Sciences,Nanjing University;  
Radiometric quality of satellite's image is closely related to its monitoring capability.GF-1 is the first satellite of China's high-resolution earth observation system and has an important application value in monitoring mountain snow.In this paper,we compare the radiometric quality of GF-1 satellite image to the similar overseas high-resolution satellite SPOT-6 and RapidEye in snow-covered area of Manasi River Basin.The results could provide some advices for future GF series satellites' development in China.Using the image statistical features,average gradient,information entropy,and SNR,the radiometric quality of the three satellite images is compared.The results show that the GF-1's image statistical features and average gradient has the best performance.However,the information entropy has a certain gap compared with the other two satellites due to the depth of radiation.GF-1 partially supersaturated during snow imaging,resulting in part of region having zero value.After removing these outliers,GF-1 image's SNR is re-estimated and found to be significantly superior to other satellites in the blue,red,and panchromatic bands,whereas,the green and near-infrared bands still have a certain gap compared to SPOT-6,but similar to RapidEye.Overall,the radiometric quality of GF-1 image in the mountainous snow-covered area has basically reached the level of similar satellites in the world and some indicators are even better than other satellite images.Limited to the depth of radiation and the range of radiation energy accepted by the sensor,an over-saturation phenomenon will appear in some snow-covered regions,the follow-up can be further improved in this regard.
【Fund】: 国家自然科学基金项目(41671344、41601366)
【CateGory Index】: TP751
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